Mixer



April 17, 1951 c. M. OSTERHELD 2,549,121

MIXER Filed July 8, 1946 I IIIIH III n 7Q 1 IN VEN TOR.

CLARK M. OSTERHELD BY MM Patented Apr. 17, 1951 MIXER Clark M. Osterheld, Stoughton, Wis., assignor to McGraw Electric Company, Elgin, 111., a corporation of Delaware Application July 8, 1946, Serial No. 682,032 2 Claims. (01. 259-108) tators therefor.

An object of my invention is to provide a novel form of drive for the agitators of mixers.

Another object of my invention is to provide a permanent magnet drive for mixers.

Another object of my invention is to provide an assembly in food and drink mixers cooperative with a permanent magnet drive.

Other objects of my invention will either be pointed out in the description of several forms of devices embodying my invention or will be set forth therein, particularly in the appended claims. 1

In the drawings,

Figure 1 is a view mainly in vertical section of a mixer embodying my invention,

Figs. 2, 3 and 4 are horizontal sectional views taken along the lines 22, 33 and 4-4 re-'- spectively in Fig. 1.

In the drawings is shown a device embodying my invention comprising a container 61 which is adapted to be inserted in and removed from a supporting housing 95. The container 61 as well as the housing 95 may be made of a plastic material such as Bakelite. The supporting housing 69 is supported by a rest 1| which is substantially of annular shape and is adapted to be closed by a plate 13 which may be either of metal or of Bakelite.

I provide a small electric motor 15 which is supported within the hollow housing 69 so that its shaft extends substantially vertically. Supporting means for the motor 15 includes an annular member 11 provided with four outwardly extending arms 19, portion 11 having secured thereto the motor 15 as by a plurality of shortmachine screws 8 I, while the upper ends of arms 19 are secured against downwardly projecting lugs by machine screws 83. I

The motor shaft 85 has mounted thereon a driving member 81 which is provided with a central opening therethrough to receive shaft 85 as well as two horizontally extending arms 81 which are provided with recessed upper projections 89. A permanent magnet 9|, which may be made of Alnico, has two depending lugs 93 which are adapted to extend into the recesses in lugs 89 to cause rotation of the permanent magnet 9| by the motor 15. The upper end of housing 69 is covered and closed by a metal of plastic housing 95 which is provided with a depending portion 91 which is substantially flat and is provided with a central aperture 99, which aperture is adapted to receive the upper end of a short shaft which extends through magnet 9|, which latter is held in proper operative position relatively to the lower portion 91 as by a nut I03 having screw-threaded engagement with the lower end portion of shaft IOI. Permanent magnet 9| may rotate on a bearing washer I which is held by nut I03. A spacing washer I00 around shaft MI is located between the upper surface of magnet 9| and the lower surface of member 91.

Container 61 is provided with an agitator which comprises vanes I 01 and a permanent magnet I09. Permanent magnet I09 is adapted to rest upon a support III which is of substantially inverted saucer shape. A nut I08 and washer I05 hold the vanes I01 and magnet I09 on shaft II3, a tubular bushing I|0 being provided around shaft H3.

I provide an upwardly extending shaft II3 which has a knob I I5 at its upper end and which has at its lowermost end an enlargement 1 effective to hold the combined vane and permanent magnet structure in proper operative position within the container 61. I provide in the container 61 two radially inwardly extending spring members II9, the design and construction of the lower end N1 of vertical shaft H3 and of the spring members |I9 being such that it is easy for the operator to pull out the structure comprising shaft II3, vanes I01 and permanent magnet I 09 as well as to re-insert the same whenever desired or necessary. Further, the container 61 may be removed from the base and reinserted easily and conveniently whenever desired.

The device embodying my invention thus provides a relatively simple means for driving an agitator comprising permanent motor driven magnets and is not dependent upon the use of a winding substantially supported and effective to create a so-called rotating field.

Various modifications may be made in the device embodying my invention without departing from the spirit and scope thereof, and all such modifications coming clearly within the scope of the appended claims shall be considered as part of my invention.

I claim as my invention:

1. In an electric-motor-driven, magnetic mixer, in combination, a base having a seat for supporting and locating a container thereon, an electric motor in said base, a first permanent magnet mounted in said base for rotation by said motor about substantially a vertical axis through the center of a container located on said seat, the poles of said first magnet being positioned to flank the lower portion of such container, and an agitator comprising a second permanent magnet with spaced poles adapted to be rotated in such container between said poles of said first magnet by the magnetic force exerted by said first magnet as it rotates and thereby carries its poles around the container. 7

2. The combination of claim 1 wherein said first magnet is a bar having a horizontal portion below said seat connected to said motor, and end portions extending upward therefrom to flank the position of a container on said seat.

CLARK M. OS'IERHELD.

' 4 REFERENCES CITED The following references are of record in the file of this patent:

UNITED STATES PATENTS Number Name Date 1,242,493 Stringham Oct. 9, 1917 1,420,774 Stainbrook June 27, 1922 1,984,975 Lodder Dec. 18, 1934 2,175,321 Safiir Oct. 10, 1939 2,356,784 Graham Aug. 29, 1944 

